Journal
REACTION KINETICS MECHANISMS AND CATALYSIS
Volume 132, Issue 2, Pages 655-669Publisher
SPRINGER
DOI: 10.1007/s11144-020-01911-8
Keywords
Selective catalytic reduction; CeO2-WO3; Interaction; Solid solution; Redox ability
Categories
Funding
- National Natural Science Foundation of China [U1904174]
- Young Teacher Foundation of Henan University of Urban Construction [YCJQNGGJS201903]
- Henan Key Scientific Research Projects [20A610003]
- Innovative Training Program for College Students in Henan Province [202011765035]
- Key Scientific and Technological Project of Henan Province [202102310341, 202102310604, 202102310280]
- Doctoral Research Start-up Project of Henan University of Urban Construction [990/Q2017011]
- Natural Science Foundation of Henan Province
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The catalytic activity of CeO2-WO3 catalysts depends on the content of WO3, the interaction between WO3 and CeO2, and the formation of redox ability. Excessive WO3 can decrease the SCR activity.
CeO2-WO3 (CW) catalysts were prepared by situ self-assembly method for the selective catalytic reduction (SCR) of NOx with NH3. With the increasing content of WO3, the interaction between WO3 and CeO2 improved, resulting in the formation of more acid sites, CeO2-WO3 solid solution and excellent redox ability, which could enhance the catalytic activity. Furthermore, an excess of WO3 over CW catalysts could decrease the SCR activity due to the attenuation of interaction. Hence, CW-20 (WO3 was 20 wt% over CeO2-WO3) possessed the widest active temperature window and nearly 100% NOx conversion was obtained at 225-400 degrees C, which relied on the contents of WO3.
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